How to remove "duplicate" status from the listing I want to keep and maintain.

I recently acquired a business and soon found out that it had three listings in Google. One was verified, but this was not the listing that comes up primarily in a Google search. This has resulted in recent positive Google reviews being attributed to one of the listings that is marked as a duplicate. I deleted the undesired duplicates (the ones that don't have the reviews), but the one that I am left with is still listed as duplicate. How can I remove duplicate status from this listing so that it can be verified, edited, etc.?